docs/GoCourseDay1.pdf: fix error in operator table. Communications op was listed as a binary; it isn't any more.
docs/GoCourseDay1.pdf: fix error in operator table.
Communications op was listed as a binary; it isn't any more.

R=golang-dev, rsc
CC=golang-dev
http://codereview.appspot.com/4637041

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go